Facet development during platinum nanocube growth
Facet development during platinum nanocube growth
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DOI：
10.1126/science.1253149
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发表时间：
2014-08-22
期刊：
影响因子：
56.9
通讯作者：
Zheng, Haimei
中科院分区：
文献类型：
--
作者：
Liao, Hong-Gang;Zherebetskyy, Danylo;Zheng, Haimei
了解纳米晶的晶面是如何发展的，对于控制纳米晶的形状和设计新型功能材料至关重要。然而，由于缺乏直接观察，多晶面发展的原子途径大多是未知的。我们报告的成像铂纳米立方体生长在液体细胞中使用透射电子显微镜具有高的空间和时间分辨率。所有低折射率刻面的生长速率相似，直到{100}刻面停止生长。其余晶面的连续生长导致纳米立方体。我们的计算表明，低得多的配体迁移率的{100}面是负责逮捕{100}生长面。这些发现揭示了纳米材料的形状控制机制和未来的设计。
An understanding of how facets of a nanocrystal develop is critical for controlling nanocrystal shape and designing novel functional materials. However, the atomic pathways of nanocrystal facet development are mostly unknown because of the lack of direct observation. We report the imaging of platinum nanocube growth in a liquid cell using transmission electron microscopy with high spatial and temporal resolution. The growth rates of all low index facets are similar until the {100} facets stop growth. The continuous growth of the rest facets leads to a nanocube. Our calculation shows that the much lower ligand mobility on the {100} facets is responsible for the arresting of {100} growing facets. These findings shed light on nanocrystal shape-control mechanisms and future design of nanomaterials.